A sound way to establish your avoirdupois (5)

I believe the answer is:

weigh

I'm a little stuck... Click here to teach me more about this clue!

'establish your avoirdupois' is the definition.
I can't tell whether this defines the answer.

'a sound way' is the wordplay.
'a sound' shows a homophone (sound like).
'way' is a homophone of 'WEIGH'.

'to' is the link.

Can you help me to learn more?

(Other definitions for weigh that I've seen before include "Estimate the heaviness of" , "Raise anchor" , "Assess" , "Consider carefully" , "Tip the scales at" .)

I've seen this clue in the Evening Standard.

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